Mold-making machine



Aug 15 0 1926:. v 1595;600 H. L. DEMMLER MOLD MAKING MACHINE Filed Sept. 14, 1923 4 Sheets-Sheet 1 H. L. DEMMLER MOLD MAKING MACHINE Filed Sept. 14 1923 4 Sheets-Sheet 2 Aug. 10 1926.

H. L. DEMMLER MOLD MAKING MACHINE Filed Sept. 14

1923 4 Sheets-Sheet 3 i v t "j 0%".

Aug. 10,1926. 1,595,600

I I H. L. DEMMLER MOLD MAKING MACHINE Filed Sept. 14, 1923 4 Sheets-Sheet 4 6 ject of t Patented Aug. 19,1926."

mew s'r TEs HENRY L. nnivrmnna, or KEWAN'EE, IILLINOIS.

MOLD-MAKING MACHINE.

Application filed September 14, 1923. Serial No. 662,602.

The present invention relates to machines for making molds or, cores by forcing sand into a flask or core boxby compressed air or other ressure fluid. The principal oblie invention is the provision of means for pneumatically operating the various parts of the machine and for controlling the operations by conveniently accessible valves. In machines in which sand is forced into the flask or core box by C0111- Figure 2 is a vertical section on the line 22 in Figure 1.- v Figure 3 is an enlarged sectional view of.

the main blast valve on the line 33 in Figure 2. Figure 4 is an enlarged sectional view of a controlvalve on the line 4 l in' Figure 2.

Figure 5 is a front elevation of the control valve. v

Figure 6: is an enlarged top plan of another control valve. I

Figure 7 is a section on the line 7'7 in Figure 6. Y

Figure 8 is a section on the, line. 8-8 in Figure 2. 1-

Figure 9 is a broken sectional view of a modified form of themain blast valve.

In the machine illustrated in the draw ings the mold or core is to be formed in the flask or core box 1 and hereafter the word flask will be used to comprehend all m'old forms. The flask 1 is removably sup- .ported on a table 2 and during formation of the mold the flask is to be clamped against the sand container 9. The table 2 is formed as a cylinder slidableon a piston 3 which is supported in the frame'by a screw.4 so that the pistonand table maybe vertically adjusted to accommodate diiferent flasks. The

table 2 is provided with pins 5 extending jslidably through the piston3 and formed with heads to limit upward movement of casing 17f the table. The table is normally held in lower position by gravity and is movable upwardly to clamp a flask against the sand container by compressed air supplied to the space between the under s'id'e of the table and the piston head througha flexible pipe 6 connected with a port 7 of valve casing 8.

The flask 1, in addition to" being clampable against the sand container 9' by the table 2, may be laterally secured between the clamps 10. Each of the opposing clamps 10 is carried. by a piston" 11 reciprocablein a cylinder 12 secured to the table 2. The pist-on 11 with its clamp 10 is normally held in retracted position. by a spring 13 and may be moved forwardly to clamping posi. tion by compressed air supplied against'the outer face of the piston. Compressed air is supplied to one of the'pistons (the one to the left in Figure 2) by a flexible pipe 14 connected with the same port 7 of valve casing 8 with which is connected the pipe 6 supplying compressed air to raise the table 2. The other .pistonll is supplied with compressed air through the flexible pipe 15 connected with a valve casing 16.

V Vhen the flask is clamped in position in registration with the sand container 9 it is adapted to be filled with sand forced from the container into the flask by a blast of compressed air admitted through the valve Referring especially to Figure 3, the valve casing 17 isformed with an inlet port 18 to be connected with a source of compressed air and with an outlet port or passage 19 directed into the sand container. The ports 18 and 19 are of relatively large area so that a heavy blast of air may be directed into the sand container. Preferably the port 19 is formed with baifles 20 and 21. Air is constantly admitted to the valve casing through the inlet port 18 but the outlet port is'alternatively opened'or closed by a slide valve 22. The valve 22 is p1 uvided with a valve rod 23 carrying a cup leather piston 24: slidably fitted in a. cylindrical portion '25 of the valve casing. The

valve is normally held in the open position shown in Figure 3 by pressure of the air in the casing against the inner face of the piston 24. The valve may be moved to closing position by compressed air supplied to the outer face of the piston 24 through a flexible pipe 26, aided'by a compression spring- 28. The'pipe 26 is'connected with ing 17 is provided with a relief port v30 opening to atmosphere from the port 19 be-' tween the valve 22 and the outerend of the port. The relief port 30 is controlled by a valve 31 hinged on a shaft 32, thevalve 31 being provided with escrow-adjustable flexible block adapted to close the outer end of the relief' port 30 when the valve 31 is swung on the shaft 32. The valve casing 8 through which the table 2, one of the clamps 10, and the valve 22'are controlled is'illustrated in detail in Figures 4 and 5. The casing is p'rovidedwith a pipe34 for the constant supply of compressed air to the casing. The casing, in'addition to the port 7 through which compressed air is supplied to the table 2 and the clamp 10, and the port 27 through which air is supplied to control the main valve 22, is provided with an exhaust port 35. The ports are controlled by a slide valve 36, thevalve rod 37 being fiex ibly connected with'a treadle 38 and normally held in raised position, as illustrated. in Figure 4, by a spring 39. (In the claims the valve 36 is referred 'to as'manually oper-, able, this phrase being intended to include hand and foot operationin distinction to aiitomatic or mechanical operation.) In this position the pip 6 opening below the table- 2 and the pipe 14 opening behind the clamp piston 11 are connected with the eX- haust port 35 so that the table and clamp are retracted ;-the pipe 26 is open to the passage of air from the supply pipe' 34'so that pressure is supplied against the outer face of the piston 24 to hold the main valve 22 in closed position, in alternation to the open position inwhich -it is illustrated in Figure 3.

The valve 31 controlling the relief port 30 is provided with a rod 40 normally held in raised position to open the relief port by a spring 41 but depressible by a link 42 connected with the treadle 38. VVhen'tbe chine.

treadle isdepressed to connect the pipe 26 with the exhaust port 35 in v-alve casing 8 and thus permit the main valve 22 to open, the valve 31 is depressed to close the relief port 30. i v

The sand container 9 is carried b a support 43 which is horizontally movableon rollers 44 secured to the frame of the ma- The sand container is preferably open at its top for the admission of sand and the. air blast through the main valve cas ing 17 and is provided with a bottom plate perforated forthe discharge of sand and air into the flask. The support 43 is normally held so that the sand container is not positioned over the table 2 (to the right of the below a sand supply hopper 51.

solidmold in the flask.

The support 43 piston'46 connected with the sand container 7 by a rod 47, the piston being slidable in a cylinder 48 connected by a pipe 49 with a valve casing 50; p

.VVhen the support 43 is-in normal position, to the rightof the position shown in Figure 2, the sand container 9 is positioned port 43-is in form a plate so that when it is moved toposition' the container over the table 2, the support or plate-43 closes the outlet from the hopper '51. It is important that sand supplied "from the hopper 51 to the sand container 9 be firmly compacted in the container before it'is subjected to the blast by which it .is forced into the flask. This mode of operation provides for-the formation of a much more accurate and For this purpose a cylinder 52 is supported above the hopper The supv 51 and slidable therein is a piston 53 carry-' ing a' plunger 54. The piston and plunger are normally held in raised position by a weight 55 supported by a cable 56 extending through a groove 57 in. the rod connecting the piston 53 and plunger 54 and secured to the lower end of the rod. The piston and plunger are depressible by compressed air admitted against the upper face of the piston 53 through a pipe a valve casing '59. Y

- It is often desirable 'to stir the sand in the hopper 51 so that it will flow freely into the sandcontainer; For this purpose the 58 connected with sleeve in which the rod of plunger 54 slides supports a rotatable sleeve 6O carrying stirring blades 61 and a gear 62. The lat ter meshes with a pinion 63 fixed on a shaft 64 rotatableby any desired means such as. the application of power to a pulley v65.

After the sand has been blown into the flask 1 to form a mold it is often desirable to ram the mold still further to compact the sand forming it. The support 43 carries a cylinder 66 in which is fitted a piston 67 carrying a ram- 68 normally held in raised position by a spring 69. 'The ramis depressible by the supply of compressed air against theupper face of the piston 67 through a flexible pipe 70 connected with the same port of valve casing 59 with which is connected the pipe 58 supplying compressed air-to depress the plunger 54.. The

sand container 9 and the ram :68 are sup- The. valve casing 16 controlling one of the clamps 10, the valve casing 50 controlling movement of the support 43carry1ng the ,sand container and ram 68, and the responding port of valve casing 16 is connected with pipe and the corresponding port of valve casing 50 is connected with pipe 49. The valve casing 59 encloses a disk valve 73 formed with .a port 74 through which compressed air from pipe 71 is supplied through port 72 when port 74 rs brought into register with the latter. The casing is also provided with an exhaust port 75 with which the port 72 maybe connected by a passage 76 formed in the valve 73 when the latter is rotated to proper position.

The machine is operated in the following manner. Looking at Figure 2, assume that air is exhausted frombelow the table 2 so i that the flask 1 is lowered from contact with the sand container 9; and'that air is ex hausted from behind both pistons 11 so that the clamps 10 are in retracted position. The operator then rotates'the valve 1n valve casing 50 to exhaust air from the cylinder 48, whereupon the spring moves the support 43 to the right to positionthe sand container 9 under the hopper 51 and the ram 68- over the flask 1. The operator next rotates the valve in valve casing 16 to supply air behind the piston ot' the right hand clamp 10, thus clamping the flask against the other clamp 10. Sandnow flows from the hopper 1nto the sand container and the operatorrotates piston 11, thus releasing the flask which is removedfrom the machine. The valve in casing 50 is then rotated to admit air to the cylinder 48 to move the support 43 to posi.

tion the sand container under the valve oasing 17, as illustrated'in Figure 2. 'A new flask is placed on the table 2 below the sand container. Theoperator then depresses the treadle 38 to move the valve 36 downwardly from the position inwhich it is shown in Figure 4. As the valve moves downwardly it permits the supply of compressed air from pipe 34 through pipes 6 and 14, thus raising the table 2 to clamp the flask against the sandcontainer and advancing the left clamp 10 to clamp the flask against the other clamp 10. Almost simultaneously the valve also opens the pipe 26 to the-exhaust port 35 permitting the escape of air from behind the piston 24 so that the compressed air in the casing 17-opens the main valve 22,/so that a heavy blastot air is directed into the sand container to force sand therefrom intolthe flask. Depression of the treadle 38 at the same time-swings the valve 31 downwardlytoclose the relief port 30' in the main valve casing, The moldis formed almost instantly, whereupon the operator releases the treadle 38 so that the spring 39 reverses the valve 36,4intothe position in which it' is shown in Figure 4. In this position air is.

supplied against the outer face of the piston 24, thus closing 'the main valve and almost instantaneously the'pipes 6 and 14 are contable 2- and clamp 1O and'fr'ee the flask.

l/Vhen the tr eadle 'is released the spring41 raises the valve 31 to open the relief port 30 through which any excess pressure in the sand container is dissipated. The sequence of operations is then repeated.

The jmain blast valve may, if desired, be constructed as shown in Figure 9 instead of as shown in Figure 3. In Figure 9 the valve casing. 80 is substantially similar to the casing 17 and has an inlet port connected with the outlet port or passage 19. The valve 81-controlling the outlet port is secured to a stem 82 on which is mounted a difierentlal piston. The differential piston comprises a smaller face or piston- 83 slidable in a cylinder 84 and a larger face or piston packing 88 and is provided, with a head 89 to limit movement of thevalve mechanism. In this form of valve pressure of fluid admitted to the casing throughthe inlet port normally holds the valve in one position,

preferably open position, by pressure against the smaller piston 83. The valve maybe moved to closed position by admission of pressure fluid against the outer face of the larger piston 85 through a pipe 87 controlled as is the pipe 26in Figure 3. When pressure is exhausted from the face of the piston 85 the valve automatically returns to normal position.

Having thus described my invention, what I claim is duit for thesupply of fluid to and from the opposite face of the said piston and a valve controlling the two said conduits alternately,

2. A valve mechanism comprising, a cashaving a conduit t'heretln'ou'gh, a valve for closing said conduit, apiston connected to-said valve and exposed at one face to the said valve in one directionunder the influence of' the fluid in the casing, and means for supplying fluid to the other face of said piston to move the valve in the opposite direction. 1

4:. A valve mechanism for the purpose described comprising, a casing having a primary conduit therethrough and a pressure relief conduit from said primary'conduit, a

valve for closing said conduit, fluid pressure actuated means connected to said valve and exposed to the fluid entering said casing for moving said valve in one direction, means for supplying fluid to said fluid pressure actuated means for moving said valve in the other direction, and means for opening and closing said relief conduit.

5. A valve mechanismfor the purpose de scribed comprising,- acasing having a conduit therethrougln'a valve for closing said conduit, fluid pressure actuated means connected to said valve and exposed to the fluid entering said casing for moving said valve in one direction, means for supplying fluid to said fluid pressure actuated means and casing for moving said valve in opposite directions, and means for controlling said supply means.

6. In a molding machine, the combination of a sand container, a valve casing having a passage for supplying fluid under pressure to the container to force sand into a flask, a valve in the casing controlling the passage and operable under pressure of fluid supplied thereto to open said passage, said casing having a relief port between the valve and the container, a valve controlling said relief port, and means for controlling said relief port valve Whereby'it Will be closed simultaneously with the opening movement of the valve controlling the passage in the casing, and vice versa. l

,7. In a molding machine, the combination of a sand container, a valve casing-having a passage for supplying pressure fluid to the container to force sand into a flask, a valve in the casing controlling the passage, the passage having a relief port between the valve and container, a conduit for the passage of pressure fluid to control the valve, a

valve controlling the conduit, 21. valve con-' trolling-the relief port,'and means for simultaneously operating the two last-named valves to open the passage and close the relief port and vice versa.

8. In a molding machine, the combination of a sand container, a valve casing having a passage for supplying pressure fluid to the container to force sandinto a flask, a valve in the casing controlling the passage, the

passage-having a relief port between the valve and container, a conduit for the passage of pressure to control the slide valve,

a valve controlling the conduit, a hinged valve controlling the relief port, and means for moving the conduit-controlled-valveto open the passage and for simultaneously swinging the hinged valve to close the relief port and Vice versa.

9. In a molding machine, the combination of a sand container, a clamp reciprocable toward and from the container, a

"first conduit for the passage of pressure fluid to control the clamp, a valve casing having a passage for su plying pressure fluid to the container to orce sand into a flask, a valve in the casing controlling the passage, the valve having a pistonhaving one face exposed to'pressure fluid in the easing, a second conduit for the passage of pressure fluid to and from theopposite face of the piston, a valve casing having ports respectively connected with the two con duits and having an exhaust port, and a valve, in the last named casing adaptedto connect the respective ports alternatively with a supply of fluid pressure and 'the ex: haust port.

10. In amolding machine, the combination of a sand container, a vertically reciprocable clamp below the container, a horivalve, a second conduit for the supplyof pressure fluid to-the opposite face of the piston, a'valve casing havingports respectively connected with the two conduits and having an exhaust port, and a valve in the last named casing adapted in alternative positions to open one of the conduits to a supply of pressure fluid and the other to the exhaust port. V

11. In a molding machine, the combination of a vertically reciprocable plunger, a

second vertically reciprocable plunger hori- 3 reciprocation,

' zontally movable relatively tothe first plunger, and means for simultaneously reciprocating the plungers.

12. In a molding machine, tion of a vertically reciprocable plunger, a support movable relative to said plunger in a direction transverse to its direction of asand container carried by the support and adapted to be positioned in register with the plunger, a second verti-.

cally reciprocable plunger carried by the support, and means for simultaneously re-. 'ciprocatmg the plungers.

13. In a molding machine, the combina tion of a table, a fluid pressure supply device above the tablc, a hopper, a horizontally" movable support, ,a sand container carried by the support and adapted to be positioned alternatively in register with the device or the hopper, a vertically reciprocable plunger carried by the support and adapted to be positioned above the table, a plunger vertically reciprocable in the hopper, and means for simultaneouslyreciprocating the plungers.

14. In a molding machine, the combination of a table, a' fluid pressure supply device above the table, a hopper, a horizontally movable support, a sand container carried by the support and adapted to be positioned alternatively in register with the de vice or the hopper, a vertically reciprocable plunger carried by the support and adapted to be positioned "above the table, aplunger vertically reciproc'able in the hopper, the plungers being provided with pressure depressible pistons, means tending to hold the plungers in raised position, a conduit for the supply of pressure fluid to the pistons, and a manually operable valve controlling the conduit. I

15. In a moldin machine, the combination of a reciproca 1e plunger, a second reciprocable plunger movable relatively to the first plunger transversely of the direction of reciprocation, and meansffor simultaneously reciprocating theplungers. i

16. In a molding machine, the combination of a .sand container, at reciprocable plunger for compacting sand in the con- .the combina;

from the container into the form by'gaseous fluid pressure. v

17. In a molding machine, the combination of a sandcontainer, means for securing a mold form'to the container, means for vforcing sand from the container into the form 10 gaseous'fiuid pressure, and a re-:

ciproca le plunger for ramming the sand in the form.

18. In a moldingjmachine', the combina-i tion of a sand container, af'sand supply, de-

vice, means for agitating the sand in the device to feed'the sand into thecontaine'r' and pneumatically operable means for operating sand into the container.

19. In a molding machine, the combination of a hopper, a sand container, a member revoluble in the hopper to feed sand into the container, and a reciprocable-plunger operating within the hopper for compacting sand inthe container.

20. In a molding machine, the combination with a hopper having discharge opening atits lower end, of a sand container adapted to b'e'disposed below said discharge opening, a vertically reciprocal plunger operating within the hopper for compacting sand in the container, and an agitating means for the sand located within the hopper and rotatably; mounted about the plunger.

21. In a molding machine,-the combination with a hopper having discharge opening at its lower end, of a sand container adapted to be disprised below said discharge opening, a vertical y reciprocal plunger operating within the hopper for compacting .sand in the container, and an agitating within said device fo-r compacting means for the sand located Within the hopper and rotatably mounted about the plunger, said agitating means comprising a sleeve surrounding said plunger, agitating blades fixed to said sleeve, and means for rotating said sleeve.

In witness whereof, I hereunto subscribe my name this HENRY L. DEMLILER.

10th day of September, 1923. 

